My son went to London last Fall. He really enjoyed it. The classes were not super difficult but he enjoyed them. The school organized a lot of trips for them to see England. He also participated in some volunteering, he taught gardening at an elementary school after school program. He loved the freedom of living in London and made some new friends.
He’s back in Boston now, and enjoying himself. He says the workload is much more significant, so he has had to buckle down and study more. He is gotten involved with some clubs and study groups. He’s doing fine.
I think NUin is a decent way for kids to experience something new and forces the kids to live independently. There are a lot of bright kids in his group. They’ve stayed friends in Boston too, so that’s nice.
Good luck.